Use method of primary brine preheating efficient heat exchanger

Abstract

The invention discloses a primary brine preheating efficient heat exchanger and a using method, the primary brine preheating efficient heat exchanger comprises a shell, a first tube box and a second tube box are arranged on the shell, a first cavity and a second cavity are formed in the first tube box, and a partition plate is arranged between the first cavity and the second cavity; a preheating pipeline is arranged on the first pipe box and communicates with the shell, multiple sets of preheating assemblies are arranged on the outer wall of the preheating pipeline, the multiple sets of preheating assemblies are evenly arranged in the axial direction of the preheating pipeline, the preheating assemblies are arranged in the first cavity, and the preheating assemblies communicate with an inner cavity of the preheating pipeline; the device has the beneficial effects that part of hot fluid is guided into the preheating pipeline through the split-flow type preheating structure, primary saline water in the first cavity is subjected to multi-stage disturbance heating through the rotary preheating assemblies evenly distributed in the axial direction, the laminar boundary layer of cold fluid is broken, the turbulence effect is formed, and the heat transfer coefficient is increased.

Description

Technical Field

[0001] The present invention relates to a method for using an efficient heat exchanger for preheating primary brine. Background Art

[0002] In the salt-making process, primary brine usually refers to the raw brine collected from salt fields, salt mines or brine, which has complex components and contains a large amount of impurity ions such as calcium, magnesium, sulfate radicals and suspended particles. Such brine needs to be preheated to a set temperature through a heat exchanger before evaporation and crystallization to reduce the subsequent evaporation energy consumption and improve the crystallization efficiency.

[0003] However, traditional heat exchangers rely on a single main heat exchange process. After the hot fluid completes the main heat exchange, it is directly discharged from the system without recycling and reusing the waste heat, resulting in energy waste and relatively high comprehensive energy consumption. In view of this, the present invention proposes a method for using an efficient heat exchanger for preheating primary brine to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for using an efficient heat exchanger for preheating primary brine to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: An efficient heat exchanger for preheating primary brine includes a housing, on which a first tube sheet and a second tube sheet are provided. A first cavity and a second cavity are provided in the first tube sheet, and a partition plate is provided between the first cavity and the second cavity; A preheating pipeline is provided on the first tube sheet, and the preheating pipeline is communicated with the housing. A plurality of preheating components are provided on the outer wall of the preheating pipeline, and the plurality of preheating components are uniformly arranged along the axial direction of the preheating pipeline. The preheating components are arranged in the first cavity and are communicated with the inner cavity of the preheating pipeline. There is liquid flowing in the first cavity, so that the preheating components rotate and accelerate heat exchange in the first cavity.

[0006] As an improvement of the above technical solution, a heat exchange liquid inlet pipeline and a heat exchange liquid outlet pipeline are provided on the housing. The heat exchange liquid inlet pipeline is provided above the housing, and the heat exchange liquid outlet pipeline is provided below the housing; The preheating pipeline is communicated with the heat exchange liquid inlet pipeline and the heat exchange liquid outlet pipeline.

[0007] As an improvement of the above technical solution, a fluid inlet pipeline and a fluid outlet pipeline are provided on the first tube sheet. The fluid inlet pipeline is provided above the housing, and the fluid outlet pipeline is provided below the housing; The preheating pipeline is arranged between the fluid inlet pipeline and the fluid outlet pipeline, and the preheating pipeline, the fluid inlet pipeline and the fluid outlet pipeline are coaxially arranged. The diameter of the preheating pipeline is smaller than the diameter of the fluid inlet pipeline.

[0008] As an improvement of the above technical solution, a first installation pipeline is arranged on the heat exchange liquid inlet pipeline, and a second installation pipeline is arranged on the heat exchange liquid outlet pipeline; A first connection pipeline is arranged on the fluid inlet pipeline, a second connection pipeline is arranged on the fluid outlet pipeline, and the inner cavities of the preheating pipeline, the first connection pipeline, and the second connection pipeline are communicated; The first connection pipeline and the first installation pipeline are connected by a flange, and the second connection pipeline and the second installation pipeline are connected by a flange.

[0009] As an improvement of the above technical solution, the first installation pipeline is provided with a first bending portion, and an included angle A is provided between the axis of the first bending portion and the axis of the heat exchange liquid inlet pipeline, and the included angle A is less than 60°; The second installation pipeline is provided with a second bending portion, and an included angle B is provided between the axis of the second bending portion and the axis of the heat exchange liquid outlet pipeline, and the included angle B is less than 60°.

[0010] As an improvement of the above technical solution, four groups of limiting rings are evenly arranged in the first cavity, the four groups of limiting rings are evenly arranged on the outer wall of the preheating pipeline, and multiple groups of limiting through holes are arranged between every two groups of limiting rings; The preheating assembly is arranged between two groups of limiting rings.

[0011] As an improvement of the above technical solution, the preheating assembly includes a rotating ring, and the rotating ring is rotationally and sealingly arranged between two groups of limiting rings; Multiple groups of disturbance sealing shells are arranged on the rotating ring, multiple groups of connection holes are formed in the rotating ring, the multiple groups of connection holes are communicated with the inner cavities of the multiple groups of disturbance sealing shells, and the fluid in the preheating pipeline sequentially enters the disturbance sealing shells through the limiting through holes and the connection holes.

[0012] As an improvement of the above technical solution, the disturbance sealing shell is provided with a disturbance rod, disturbance plates are arranged on both sides of the disturbance rod, the disturbance plates are obliquely arranged on the disturbance rod, and the inner cavities of the disturbance rod and the disturbance plates are hollow; The fluid in the preheating pipeline sequentially enters the inner cavities of the disturbance rod and the disturbance plates through the limiting through holes and the connection holes.

[0013] The usage method of the primary brine preheating high-efficiency heat exchanger includes the following steps: S1. Installation: Install the preheating assembly on the preheating pipeline, and install pipelines on the fluid inlet pipeline so that the fluid inlet pipeline is communicated with the external pipeline; S2. Testing: After S1 is completed, introduce a water source into the fluid inlet pipe through a pump body, and observe whether the preheating component rotates on the preheating pipe. If it does not rotate, perform maintenance on the preheating component until the preheating component can rotate smoothly when there is fluid passing through the fluid inlet pipe in this step. S3. Connection: Remove the pipeline on the fluid inlet pipe in S1, connect the first pipe box and the second pipe box to the housing, connect the first connecting pipe to the first installation pipe, and connect the second connecting pipe to the second installation pipe. S4. Fluid introduction: Introduce the hot fluid into the housing through the heat exchange inlet pipe and export it from the heat exchange outlet pipe. Introduce the cold fluid into the first pipe box through the fluid inlet pipe and export it from the fluid outlet pipe to form a heat exchange process. S5. Shunt detection: In S4, when the hot fluid is exported through the heat exchange outlet pipe, a part of the hot fluid enters the second installation pipe and performs vibration detection on the first installation pipe. When there is vibration generated by the passing of the hot fluid through the first installation pipe, it proves that the hot fluid passes through the second installation pipe, the second connecting pipe, the preheating pipe, the first connecting pipe, and the first installation pipe again and enters the heat exchange inlet pipe to form a shunt process. If there is no vibration in the first installation pipe, perform detection and maintenance on the whole. S6. Preheating: After S5 is completed, the shunted hot fluid enters the preheating pipe and completes the preheating process through the preheating component.

[0014] Compared with the prior art, the beneficial effects of the present invention are: Through a shunt-type preheating structure, part of the hot fluid is introduced into the preheating pipe, and the primary brine in the first cavity is heated by multi-stage disturbance using a rotation preheating component with uniform axial distribution, breaking the laminar boundary layer of the cold fluid and forming a turbulent effect, so that the heat transfer coefficient is improved. Through the preheating component, the primary brine completes gradient preheating before entering the main heat exchange tube bundle, reducing the temperature difference between the hot and cold fluids in the main heat exchange section, reducing the heat load and temperature difference stress, and improving the main heat exchange efficiency. Through the self-driven rotation of the preheating component, the preheating component does not require external power, relies on the flow of the hot fluid to drive the rotation, realizes passive enhanced heat transfer, has zero energy consumption, low maintenance cost, and is suitable for high-corrosion brine working conditions. Description of the drawings

[0015] Figure 1 It is a schematic structural diagram of the present invention; Figure 2 It is a side view of the present invention; Figure 3 It is the present invention Figure 2Cross-sectional view taken along A-A; Figure 4 For the present invention Figure 2 Schematic enlarged structure view at position B in the present invention; Figure 5 For the present invention Figure 2 Schematic enlarged structure view at position C in the present invention; Figure 6 Schematic structure view of the first tube sheet of the present invention; Figure 7 Schematic structure view of the preheating assembly of the present invention; Figure 8 Schematic internal structure view of the first tube sheet of the present invention; Figure 9 For the present invention Figure 8 Schematic enlarged structure view at position D in the present invention.

[0016] In the figure: 10, housing; 11, heat exchange liquid inlet pipe; 111, first connecting pipe; 112, first bending part; 12, heat exchange liquid outlet pipe; 121, second installation pipe; 122, second bending part; 20, first tube sheet; 21, fluid inlet pipe; 211, first installation pipe; 22, fluid outlet pipe; 221, second connecting pipe; 23, first cavity; 24, partition plate; 25, second cavity; 30, second tube sheet; 40, preheating assembly; 41, connection hole; 42, rotating ring; 43, disturbance sealing shell; 431, disturbance rod; 432, disturbance plate; 50, preheating pipe; 51, limiting ring; 52, limiting through hole. Detailed implementation manners

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Embodiment: As Figures 1-9 shown, this embodiment proposes a high-efficiency heat exchanger for primary brine preheating, including a housing 10, a first tube sheet 20 and a second tube sheet 30 are arranged on the housing 10, a first cavity 23 and a second cavity 25 are arranged in the first tube sheet 20, and a partition plate 24 is arranged between the first cavity 23 and the second cavity 25; A preheating pipeline 50 is provided on the first tube sheet 20. The preheating pipeline 50 is communicated with the housing 10. A plurality of groups of preheating components 40 are arranged on the outer wall of the preheating pipeline 50. The plurality of groups of preheating components 40 are uniformly arranged along the axial direction of the preheating pipeline 50. The preheating components 40 are arranged in the first cavity 23. The preheating components 40 are communicated with the inner cavity of the preheating pipeline 50. There is liquid flowing in the first cavity 23, so that the preheating components 40 rotate and accelerate heat exchange in the first cavity 23.

[0019] In this case, the cold fluid is primary brine.

[0020] In this embodiment, during use, the housing 10 is horizontally fixed to the support structure to ensure that the first tube sheet 20 and the second tube sheet 30 are respectively installed at the designated positions of the housing 10. At the same time, it is confirmed that the first cavity 23 inside the first tube sheet 20 and the second cavity 25 are effectively isolated by the partition plate 24. The sealing performance of the partition plate 24 needs to be verified by a pressure test; After that, the preheating pipeline 50 is horizontally installed on the first tube sheet 20 along the axial direction. At the same time, a plurality of groups of preheating components 40 are uniformly installed on the outer wall of the preheating pipeline 50. Each group of preheating components 40 needs to be embedded in the first cavity 23 and evenly distributed along the axial direction of the preheating pipeline 50. After that, the connectivity between the preheating components 40 and the inner cavity of the preheating pipeline 50 is checked to ensure that the fluid can enter the preheating components 40 through the preheating pipeline 50; After that, the hot fluid is introduced into the housing 10, and the cold fluid is introduced into the first cavity 23 of the first tube sheet 20 and enters the heat exchange tube bundle in the housing 10, and then enters the second cavity 25 of the first tube sheet 20 again through the baffle of the second tube sheet 30 to complete the conventional heat exchange process; At this time, when the hot fluid is exported from the housing 10, a part of it will enter the preheating pipeline 50, and the first cavity 23 is preheated through the preheating pipeline 50 and the preheating components 40 to complete the preheating process; Through the shunt-type preheating structure, part of the hot fluid is introduced into the preheating pipeline 50, and the primary brine in the first cavity 23 is heated by multi-stage disturbance by the axially uniformly distributed rotating preheating components 40, breaking the laminar boundary layer of the cold fluid and forming a turbulent effect, so that the heat transfer coefficient is improved; Through the preheating components 40, the primary brine completes gradient preheating before entering the main heat exchange tube bundle, reducing the temperature difference between the hot and cold fluids in the main heat exchange section, reducing the heat load and thermal stress, and improving the main heat exchange efficiency; Through the self-driven rotation of the preheating components 40, the preheating components 40 do not require external power, rely on the flow of the hot fluid to drive the rotation, realize passive enhanced heat exchange, have zero energy consumption, low maintenance cost, and are suitable for high-corrosion brine working conditions.

[0021] Specifically, a heat exchange liquid inlet pipe 11 and a heat exchange liquid outlet pipe 12 are provided on the housing 10. The heat exchange liquid inlet pipe 11 is arranged above the housing 10, and the heat exchange liquid outlet pipe 12 is arranged below the housing 10; The preheating pipe 50 is communicated with the heat exchange liquid inlet pipe 11 and the heat exchange liquid outlet pipe 12.

[0022] In this embodiment, when the hot fluid enters the housing 10, the hot fluid sequentially passes through the heat exchange liquid inlet pipe 11, the inner cavity of the housing 10, and the heat exchange liquid outlet pipe 12, thereby completing the heat exchange process.

[0023] Specifically, a fluid inlet pipe 21 and a fluid outlet pipe 22 are provided on the first tube sheet 20. The fluid inlet pipe 21 is arranged above the housing 10, and the fluid outlet pipe 22 is arranged below the housing 10; The preheating pipe 50 is arranged between the fluid inlet pipe 21 and the fluid outlet pipe 22. The preheating pipe 50, the fluid inlet pipe 21, and the fluid outlet pipe 22 are coaxially arranged, and the diameter of the preheating pipe 50 is smaller than the diameter of the fluid inlet pipe 21.

[0024] Specifically, a first installation pipe 211 is provided on the heat exchange liquid inlet pipe 11, and a second installation pipe 121 is provided on the heat exchange liquid outlet pipe 12; A first connecting pipe 111 is provided on the fluid inlet pipe 21, and a second connecting pipe 221 is provided on the fluid outlet pipe 22. The inner cavities of the preheating pipe 50, the first connecting pipe 111, and the second connecting pipe 221 are communicated; The first connecting pipe 111 and the first installation pipe 211 are connected by a flange, and the second connecting pipe 221 and the second installation pipe 121 are connected by a flange.

[0025] In this embodiment, the flow path of the hot fluid is as follows: The hot fluid enters the inner cavity of the housing 10 from the heat exchange liquid inlet pipe 11 above the housing 10. The hot fluid flows around the pipe through which the cold fluid in the heat exchange tube bundle flows in the inner cavity of the housing 10, and heat exchange is performed with the cold fluid through the pipe wall. After the heat exchange is completed, the hot fluid is discharged from the heat exchange liquid outlet pipe 12 below the housing 10 and enters the external system for circulation; The flow path of the cold fluid (primary brine) is as follows: The cold fluid enters the first cavity 23 from the fluid inlet pipe 21 above the first tube sheet 20. The cold fluid enters the heat exchange tube bundle in the housing 10. After absorbing the heat of the hot fluid, it is deflected by the second tube sheet 30 and re-enters the second cavity 25 of the first tube sheet 20. The heated cold fluid is discharged from the fluid outlet pipe 22 below the first tube sheet 20 and enters the subsequent process flow; The preheating process (hot fluid shunts to preheat the cold fluid) is as follows: at the outlet of the heat exchange liquid outlet pipe 12 of the hot fluid that has completed the main heat exchange within the housing 10, a part of the hot fluid is shunted through the second installation pipe 121 into the preheating pipe 50. The shunted hot fluid flows along the coaxially arranged preheating pipe 50, enters the first cavity 23 of the first tube sheet 20, and the preheated hot fluid returns from the end of the preheating pipe 50 to the first installation pipe 211 through the first connection pipe 111, and finally rejoins the heat exchange liquid inlet pipe 11 again to form a closed-loop cycle; Certainly, during the preheating process, the preheating pipe 50 and the preheating assembly 40 simultaneously perform preheating treatment on the inside of the first cavity 23; By performing multi-stage disturbance preheating on the primary brine, the temperature of the cold fluid is increased before entering the main heat exchange, the temperature difference between the hot and cold fluids in the main heat exchange section is reduced, and the heat load is lowered.

[0026] Specifically, the first installation pipe 211 is provided with a first bending portion 112, and an angle A is provided between the axis of the first bending portion 112 and the axis of the heat exchange liquid inlet pipe 11, and the angle A is less than 60°; The second installation pipe 121 is provided with a second bending portion 122, and an angle B is provided between the axis of the second bending portion 122 and the axis of the heat exchange liquid outlet pipe 12, and the angle B is less than 60°.

[0027] In this embodiment, by setting the angle A, on the basis of ensuring a closed cycle, the hot fluid in the first bending portion 112 can impact the hot fluid in the heat exchange liquid inlet pipe 11, avoiding the hot fluid in the heat exchange liquid inlet pipe 11 from strongly impacting the heat exchange tube bundle within the housing 10, resulting in vibration and corrosion of the heat exchange tube bundle; By setting the angle B, on the basis of ensuring a closed cycle, the hot fluid in the heat exchange liquid outlet pipe 12 can more conveniently enter the second bending portion 122 for the shunting process.

[0028] Specifically, four groups of limiting rings 51 are evenly arranged in the first cavity 23. The four groups of limiting rings 51 are evenly arranged on the outer wall of the preheating pipe 50, and multiple groups of limiting through holes 52 are arranged between every two groups of limiting rings 51; The preheating assembly 40 is arranged between two groups of limiting rings 51.

[0029] Specifically, the preheating assembly 40 includes a rotating ring 42, and the rotating ring 42 is rotationally sealed between two groups of limiting rings 51; Multiple groups of disturbance sealing shells 43 are arranged on the rotating ring 42. Multiple groups of connection holes 41 are opened on the rotating ring 42, and the multiple groups of connection holes 41 are communicated with the inner cavities of the multiple groups of disturbance sealing shells 43. The fluid in the preheating pipe 50 sequentially passes through the limiting through holes 52 and the connection holes 41 and enters the disturbance sealing shells 43.

[0030] In this embodiment, when the preheating pipe 50 contains a heat fluid, the heat fluid enters the disturbance seal housing 43 through the limit through hole 52 and the connection hole 41, and the heat exchange contact area is increased through the disturbance seal housing 43, so as to improve the heat exchange efficiency on the basis of disturbance, thereby improving the preheating efficiency.

[0031] Specifically, the disturbance seal housing 43 is provided with a disturbance rod 431, both sides of the disturbance rod 431 are provided with disturbance plates 432, the disturbance plates 432 are inclinedly arranged on the disturbance rod 431, and the inner cavities of the disturbance rod 431 and the disturbance plates 432 are hollow; The fluid in the preheating pipe 50 sequentially enters the inner cavities of the disturbance rod 431 and the disturbance plates 432 through the limit through hole 52 and the connection hole 41.

[0032] In this embodiment, since the disturbance plates 432 are inclinedly arranged on the disturbance rod 431, when cold fluid enters the fluid inlet pipe 21, it will impact the disturbance plates 432, causing the disturbance rod 431 to rotate, so as to improve the heat exchange efficiency.

[0033] A method for using a high-efficiency primary brine preheater heat exchanger includes the following steps: S1. Installation: Install the preheating assembly 40 on the preheating pipe 50, and install a pipeline on the fluid inlet pipe 21 so that the fluid inlet pipe 21 is communicated with an external pipeline; S2. Testing: After S1 is completed, introduce water source into the fluid inlet pipe 21 through a pump body, and observe whether the preheating assembly 40 rotates on the preheating pipe 50. If it does not rotate, perform maintenance on the preheating assembly 40 until the preheating assembly 40 can rotate smoothly when there is fluid passing through the fluid inlet pipe 21 in this step; S3. Connection: Remove the pipeline on the fluid inlet pipe 21 in S1, connect the first header 20 and the second header 30 to the housing 10, connect the first connecting pipe 111 to the first installation pipe 211, and connect the second connecting pipe 221 to the second installation pipe 121; S4. Fluid introduction: Introduce the heat fluid into the housing 10 through the heat exchange inlet pipe 11 and export it from the heat exchange outlet pipe 12. Introduce the cold fluid into the first header 20 through the fluid inlet pipe 21 and export it from the fluid outlet pipe 22 to form a heat exchange process; S5. Shunt detection: In S4, when the hot fluid is exported through the heat exchange liquid outlet pipe 12, a part of the hot fluid enters the second installation pipe 121 and performs vibration detection on the first installation pipe 211. When the first installation pipe 211 generates vibration due to the passage of the hot fluid, it proves that the hot fluid passes through the second installation pipe 121, the second connection pipe 221, the preheating pipe 50, the first connection pipe 111, and the first installation pipe 211 in sequence and then enters the heat exchange liquid inlet pipe 11 again, forming a diversion process. If the first installation pipe 211 does not generate vibration, the whole is detected and maintained; S6. Preheating: After S5 is completed, the diverted hot fluid enters the preheating pipe 50 and completes the preheating process through the preheating component 40.

[0034] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Primary brine preheating high efficiency heat exchanger, characterized by: The housing (10) comprises a first pipe box (20) and a second pipe box (30) provided on the housing (10); a first cavity (23) and a second cavity (25) are provided in the first pipe box (20); and a partition plate (24) is provided between the first cavity (23) and the second cavity (25); A preheating pipe (50) is provided on the first pipe box (20), the preheating pipe (50) is in communication with the shell (10), a plurality of groups of preheating components (40) are provided on the outer wall of the preheating pipe (50), the plurality of groups of preheating components (40) are evenly arranged along the axial direction of the preheating pipe (50), the preheating components (40) are arranged in the first cavity (23), the preheating components (40) are in communication with the inner cavity of the preheating pipe (50), liquid flows in the first cavity (23), so that the preheating components (40) rotate in the first cavity (23) to accelerate heat exchange.

2. The high-efficiency heat exchanger for primary brine preheating according to claim 1 is characterized in that: The shell (10) is provided with a heat exchange liquid inlet pipe (11) and a heat exchange liquid outlet pipe (12), wherein the heat exchange liquid inlet pipe (11) is arranged above the shell (10), and the heat exchange liquid outlet pipe (12) is arranged below the shell (10); The preheating pipe (50) is in communication with the heat exchange liquid inlet pipe (11) and the heat exchange liquid outlet pipe (12).

3. The primary brine preheating high-efficiency heat exchanger according to claim 2 is characterized in that: The first pipe box (20) is provided with a fluid inlet pipe (21) and a fluid outlet pipe (22); the fluid inlet pipe (21) is arranged above the housing (10), and the fluid outlet pipe (22) is arranged below the housing (10); The preheating pipe (50) is arranged between the fluid inlet pipe (21) and the fluid outlet pipe (22); the preheating pipe (50), the fluid inlet pipe (21) and the fluid outlet pipe (22) are coaxially arranged; and the diameter of the preheating pipe (50) is smaller than the diameter of the fluid inlet pipe (21).

4. The high-efficiency heat exchanger for primary brine preheating according to claim 3 is characterized in that: The heat exchange liquid inlet pipe (11) is provided with a first installation pipe (211), and the heat exchange liquid outlet pipe (12) is provided with a second installation pipe (121); The fluid inlet pipe (21) is provided with a first connecting pipe (111), the fluid outlet pipe (22) is provided with a second connecting pipe (221), and the inner cavities of the preheating pipe (50), the first connecting pipe (111), and the second connecting pipe (221) are connected; The first connecting pipe (111) and the first installation pipe (211) are connected via a flange, and the second connecting pipe (221) and the second installation pipe (121) are connected via a flange.

5. The primary brine preheating high-efficiency heat exchanger according to claim 4 is characterized in that: The first installation pipe (211) is provided with a first bending portion (112), an angle A is provided between the axis of the first bending portion (112) and the axis of the heat exchange liquid inlet pipe (11), and the angle A is less than 60°; The second installation pipe (121) is provided with a second bent portion (122), and an angle B is provided between the axis of the second bent portion (122) and the axis of the heat exchange liquid outlet pipe (12), and the angle B is less than 60°.

6. The primary brine preheating high-efficiency heat exchanger according to claim 1 is characterized in that: Four groups of limiting rings (51) are evenly arranged in the first cavity (23); the four groups of limiting rings (51) are evenly arranged on the outer wall of the preheating pipe (50); and a plurality of groups of limiting through holes (52) are arranged between every two groups of limiting rings (51); The preheating assembly (40) is arranged between two sets of limiting rings (51).

7. The high-efficiency heat exchanger for primary brine preheating according to claim 6 is characterized in that: The preheating assembly (40) comprises a rotating ring (42), wherein the rotating ring (42) is rotationally sealed and arranged between two sets of limiting rings (51); A plurality of groups of disturbance sealing shells (43) are arranged on the rotating ring (42), a plurality of groups of connection holes (41) are provided on the rotating ring (42), the plurality of groups of connection holes (41) are communicated with the inner cavities of the plurality of groups of disturbance sealing shells (43), and the fluid in the preheating pipe (50) enters the disturbance sealing shell (43) through the limiting through holes (52) and the connection holes (41) in sequence.

8. The high-efficiency heat exchanger for primary brine preheating according to claim 7 is characterized in that: The disturbance sealing shell (43) is provided with a disturbance rod (431), and disturbance plates (432) are provided on both sides of the disturbance rod (431). The disturbance plates (432) are obliquely arranged on the disturbance rod (431), and the inner cavities of the disturbance rod (431) and the disturbance plates (432) are hollow; The fluid in the preheating pipe (50) passes through the limiting through hole (52) and the connecting hole (41) in sequence and enters the inner cavity of the disturbance rod (431) and the disturbance plate (432).

9. The method for using the primary brine preheating high-efficiency heat exchanger according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Installation: Installing the preheating assembly (40) on the preheating pipeline (50), and installing a pipeline on the fluid inlet pipeline (21), so that the fluid inlet pipeline (21) is connected to an external pipeline; S2. Test: After S1 is completed, water is introduced into the fluid inlet pipe (21) through the pump body, and it is observed whether the preheating component (40) rotates on the preheating pipe (50). If it does not rotate, the preheating component (40) is maintained until the preheating component (40) can rotate smoothly when fluid passes through the fluid inlet pipe (21) in this step; S3. Connection: Remove the pipeline on the fluid inlet pipeline (21) in S1, connect the first pipe box (20), the second pipe box (30) and the housing (10), connect the first connecting pipe (111) and the first installation pipe (211), and connect the second connecting pipe (221) and the second installation pipe (121); S4. Fluid introduction: A hot fluid is introduced into the shell (10) through a heat exchange inlet pipe (11) and discharged from a heat exchange outlet pipe (12); a cold fluid is introduced into the first pipe box (20) through a fluid inlet pipe (21) and discharged from a fluid outlet pipe (22), thereby forming a heat exchange process; S5, Shunt detection: In S4, when the hot fluid is discharged through the heat exchange liquid outlet pipe (12), a portion of the hot fluid enters the second installation pipe (121), and the first installation pipe (211) is subjected to vibration detection. When the hot fluid passes through the first installation pipe (211) and generates vibration, it is proved that the hot fluid passes through the second installation pipe (121), the second connecting pipe (221), the preheating pipe (50), the first connecting pipe (111), and the first installation pipe (211) in sequence and enters the heat exchange liquid inlet pipe (11) again, forming a diversion process. If the first installation pipe (211) does not generate vibration, the whole is subjected to detection and maintenance processing; S6. Preheating: When S5 is completed, the diverted hot fluid enters the preheating pipeline (50) and completes the preheating process through the preheating component (40).

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